Tony Fisher (puzzle designer)

[1] In 1995 Fisher further modified the conventional rotational puzzle design by shifting its cutting planes to create a 3x3x4 cube.

3 years later the similar technique was used to build the world's first fully functional 3x4x4 cuboid which required more complex structure of edge and corner pieces.

Another technique, initially developed by Geert Hellings, rounded the centre piece of a conventional 4x4x4 cube to create additional turning layers for a uniform 2x2x4, 6x6x6 and non-uniform 2x2x6.

In June 2009 he finished making the world's first fully functional 5x5x6 cuboid which was made by modifying the internal V-cube 6 by partially rounding some of the layers and covering this moving core with 15mm cubies.

[1] The Golden Cube is considered to be Fisher’s most unusual contribution to the design of new combination puzzles,[1] and has been mass-produced by Uwe Meffert.

[8] He released a sped-up video showing how he spent two days working to solve the massive puzzle.

[4][9][10] In June 2016 Fisher also created the world's smallest functioning Rubik's Cube which measured only 5.6 millimetres on each side.